SAP Production Planning for Trading industry

we have to implement SAP PP for a trading company. There is no manufacturing setup. Finished Goods/Assembly procured from vendor and sold to customer, no in-house manufacturing setup.

there are two types of planning

1 FG: Finished Goods procured from vendor and sold to customer as it is.

2 Subcontracting Assembly: Raw material is procured from vendor and then sent to vendors location for assembly and then finished assembly is sold to customer

Here for same Finished good BOM will vary according to region/customer

so for PP module I just need to implement MRP for plant right? just need to set plant specific settings in OPPQ and activate MRP in OMDU? client need to have advance planning before the actual sales orders are punched into system. They can share 3 months demand in advance and they also need to have some buffer stock.

so here we can use MAKE TO STOCK strategy right? We can put 3 month demand by mD61 and after planning run procurement proposals will be generated and materials will be planned.